2sinAsinB is equal to
A) sin(A+B) + sin(A-B) B) cos(A-B) - cos(A+B) C) sin(A+B) - sin(A-B) D) cos(A+B) + cos(A-B)
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B ) cos (A-B) -cos (A+B)
cos A .cos .B +SinA.sin B -{ cos A .cosB -sin A .sin B )
2 sin A .sin B
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